OProfile - OProfile is an open source project that includes a statistical profiler, capable of profiling all running code at low overhead.
VisualVM - VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling...
dotMemory - dotMemory allows users to analyze memory usage in a variety of .NET and .NET Core applications.
strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Oink - Oink is a Rails plugin and log parser to help narrow down the source(s) of increased memory usage in rails applications.
perf - Perf is a simple app monitoring solution paired with meaningful alerts.